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Table 4 Results regarding the mediating role of dietary cost in the association between individual educational and household educational level and the DHD15-index and DASH score for females and males separately

From: To what extent do dietary costs explain socio-economic differences in dietary behavior?

Independent variable Mediator Dependent variable Femalesa Malesb
Indirect effect Proportion mediated Indirect effect Proportion mediated
β Bootstrap 95%CI β Bootstrap 95%CI
  Dietary cost (€/d) DHD15- index (score) Individual educational level
Middle vs. low 0.27* 0.15; 0.40 6.8 −0.02 − 0.18; 0.10 N/A
High vs. low 0.28* 0.18; 0.40 3.3 −0.03 − 0.21; 0.14 N/A
High vs. Middle 0.01 −0.07; 0.10 N/A −0.01 −0.08; 0.06 N/A
  Household educational level
Middle vs. low 0.19* 0.10; 0.31 7.1 −0.02 −0.14; 0.08 N/A
High vs. low 0.29* 0.18; 0.42 3.8 −0.04 −0.24; 0.15 N/A
High vs. Middle   0.10* 0.02; 0.19 2.0 −0.02 −0.14; 0.09 N/A
  DASH diet (score) Individual educational level
Middle vs. low 0.10* 0.06; 0.15 11.0 0.00 −0.04; 0.04 N/A
High vs. low 0.11* 0.07; 0.14 5.4 0.00 −0.05; 0.05 N/A
High vs. Middle 0.01 −0.03; 0.04 N/A 0.00 −0.02; 0.02 N/A
  Household educational level
Middle vs. low 0.08* 0.04; 0.11 11.7 0.00 −0.03; 0.03 N/A
High vs. low 0.11* 0.08; 0.15 5.8 0.00 −0.05; 0.05 N/A
High vs. Middle    0.04* 0.01; 0.07 3.4 0.00 −0.03; 0.04 N/A
  1. Abbreviations: B beta regression coefficient, CI confidence intervals, N/A Not Applicable
  2. aN = 7175 and N = 7182 for individual and household educational level, respectively
  3. bN = 2100 for both individual and household educational level
  4. *P < 0•05
  5. All analyses were adjusted for age, study center and energy intake
  6. Proportion mediated was not calculated for non-significant indirect effects